A kind of anti-shake mechanism and lens driving device with anti-shake and focusing function

Abstract

This invention proposes an image stabilization mechanism and a lens driving device with image stabilization and focusing functions. The image stabilization mechanism of this invention replaces the existing circuit components with an FPC, integrating the lower jaw and OIS support onto the FPC. The FPC has its own insulation function, reducing the need for traditional insulating substrates, thereby effectively reducing the number of components, simplifying the assembly process, and lowering product and assembly costs. It also facilitates structural thinning, thus enabling miniaturization and thinner design of the product. The lens driving device of this invention adopts ball bearing drive, which has a simple structure and simplifies the assembly process. It overcomes the problems of existing AF motors that need to overcome the elastic force of the upper and lower springs when driving the carrier to move in the Z-axis direction, as well as the problems of poor carrier optical axis stability and posture differences. This facilitates structural miniaturization, low power consumption, and improved device durability.

Description

Technical Field

[0001] This invention relates to the field of camera equipment technology, and in particular to a stabilization mechanism and a lens driving device with stabilization and focusing functions. Background Technology

[0002] Miniature autofocus cameras are widely used in mobile phones, automobiles, drones, security monitoring, smart home products, and other applications. A typical miniature autofocus camera uses a voice coil motor to drive the lens along its optical axis. A typical voice coil motor mainly consists of a housing, a lens holder that movably fits within the housing, a drive coil mounted on the lens holder, and at least two drive magnets fixed within the housing. The lens is fixed to the lens holder, and the housing has a light-transmitting hole facing the lens. During operation, a control chip controls the current input to the drive coil, causing the magnets to interact with the drive coil and drive the lens holder to move, thus achieving autofocus. However, during photography and video recording, the lens may not remain perfectly stable due to human movement or other reasons, resulting in some displacement. This affects the camera's focus and the amount of light entering the camera, consequently impacting the quality of the acquired image.

[0003] To address this, existing technologies have developed image stabilization actuators that drive a voice coil motor to move in a direction perpendicular to the lens's optical axis, thereby compensating for lens shift caused by human shake or other factors. Existing SMA image stabilization actuators include SMA wires, OIS springs, pressure plates, OIS substrates, and support components, which suffer from structural complexity and assembly difficulties. Existing AF motors also exhibit high internal complexity. Combining these two components significantly impacts assembly complexity, labor costs, and product quality. Summary of the Invention

[0004] The purpose of this invention is to propose an image stabilization mechanism and a lens driving device with image stabilization and focusing functions that effectively simplify the internal structure and improve product assembly efficiency and quality.

[0005] To achieve the above objectives, the present invention proposes a stabilization mechanism, comprising SMA wire, OIS spring, upper claw, base and FPC assembly;

[0006] The FPC assembly includes an FPC, an OIS support, a lower jaw, and a connecting block. The OIS support is fixed to the surface of the FPC, the lower jaw is fixed to the surface of the FPC through the connecting block, and the lower jaw is connected to the FPC signal through the connecting block.

[0007] The FPC is fixed on the base, the OIS spring is supported on the OIS support, the upper claw is fixed on the OIS spring, and the two ends of the SMA wire are fixed on the upper claw and the lower claw respectively. After the SMA wire is energized, the change in the length of the SMA wire drives the horizontal displacement adjustment of the OIS spring.

[0008] Furthermore, the connecting blocks are attached to the FPC surface via soldering or SMT.

[0009] The OIS support is welded to the FPC surface.

[0010] Furthermore, the FPC is equipped with four input circuits and at least one ground circuit;

[0011] Each input circuit has an input pin connected to its input terminal and a lower jaw connected to its output terminal.

[0012] The input terminal of the grounding circuit is connected to the OIS spring, and the output terminal of the grounding circuit is connected to an output pin.

[0013] The four input pins and the output pins are arranged in an orderly manner on one side of the FPC.

[0014] Furthermore, the four lower jaws are arranged in pairs, forming two groups. The two groups are located at opposite corners of the FPC, with the two lower jaws in each group arranged symmetrically from left to right.

[0015] There are two upper jaws, each upper jaw includes two terminals arranged symmetrically on the left and right, and the two upper jaws are respectively located at the diagonal of the OIS spring.

[0016] The diagonals of the upper and lower jaws are two intersecting diagonals. An SMA wire is arranged between adjacent terminals and the lower jaw, so that the four SMA wires form a square or rectangular structure.

[0017] Furthermore, each side of the OIS reed is provided with a reed elastic arm; at least one reed elastic arm is welded and fixed to the input terminal of the grounding circuit to achieve signal conduction.

[0018] Furthermore, the upper jaw and the OIS spring are either integrally formed or separately connected;

[0019] When the upper claw and the OIS spring are integrally formed, the extension of the upper claw is bent to form a terminal post with a bending angle of 90 degrees. The end of the terminal post is provided with a groove for winding the SMA thread. When the upper claw and the OIS spring are separately connected, the upper claw and the OIS spring are welded and fixed.

[0020] The present invention also proposes a lens driving device with image stabilization and focusing functions, including a shield, a lens carrier, a driving component, an AF base and an image stabilization mechanism;

[0021] The lens carrier is located inside the AF base. The side wall of the lens carrier and the inner wall of the AF base are provided with matching ball grooves. Multiple balls are arranged in the ball grooves according to the height direction of the lens carrier. Under the drive of the drive component, the lens carrier achieves vertical displacement in the height direction relative to the AF base. The shielding cover is located on the surface of the AF base.

[0022] The bottom of the AF base is provided with a protrusion that connects to the OIS spring in the image stabilization mechanism. The image stabilization mechanism and the AF motor are connected by the fixed connection between the protrusion and the AF base.

[0023] The AF motor and the image stabilization mechanism are coaxially provided with through holes for mounting the lens.

[0024] Furthermore, the drive components include an AF drive coil, a circuit board, a position sensor, and an AF drive magnet;

[0025] The circuit board is located on one side of the AF base. The position sensor and AF drive magnet are both located on the circuit board. The AF drive magnet is located on the side wall of the lens carrier and is set on the same side as the AF drive coil. After the AF drive coil is energized, it forms a magnetic field with the AF drive magnet, which drives the lens carrier to achieve vertical displacement.

[0026] Furthermore, there are at least two sets of ball bearing grooves, located diagonally opposite each other on the lens carrier;

[0027] Anti-collision protrusions are provided on the side of the AF base relative to the lens carrier and on the side of the AF base relative to the shielding cover;

[0028] The shielding cover is fixedly connected to the AF base via a snap-fit ​​connection.

[0029] The AF motor is also encased in a housing, with a through hole in the middle of the housing that is coaxial with the middle of the AF motor, which facilitates lens mounting.

[0030] Furthermore, the pins of the circuit board and the pins of the FPC in the anti-shake mechanism are arranged on the same side, which facilitates circuit conduction.

[0031] The base of the anti-shake mechanism has a baffle on the side for supporting and positioning the circuit board pins;

[0032] The circuit board is either a PCB or an FPC.

[0033] Compared with the prior art, the advantages of the present invention are:

[0034] 1. The anti-shake mechanism of this application uses FPC instead of existing circuit components, and integrates the lower claw and OIS support on the FPC, thereby effectively reducing the number of parts, simplifying the assembly process, reducing assembly costs, and making it easier to thin the structure, thus facilitating the miniaturization (thinning) design of the product.

[0035] 2. In the anti-shake mechanism of this application, after replacing the existing circuit components with FPC, it has its own insulation function, reducing the need for insulating substrates, further reducing the overall equipment cost and simplifying the assembly process.

[0036] 3. Both the upper and lower jaws adopt a 90-degree folding design for the transmission components and are equipped with winding grooves. Compared with the traditional wire clamping design structure, the jaws are easier to process, greatly improving production efficiency. At the same time, wiring is also more convenient, improving assembly efficiency.

[0037] 4. The AF motor of this invention adopts ball drive, which has a simple structure and simplifies the assembly process. It overcomes the problem of the elastic force of the upper and lower springs when the AF motor drives the carrier to move in the Z direction through the upper and lower springs, as well as the problems of poor stability of the carrier optical axis and the existence of posture difference. It is conducive to the miniaturization of the structure, low power consumption, and improved durability of the equipment.

[0038] 5. The lens carrier of the present invention differs from the traditional winding carrier. Instead, it is fixed to a magnet and driven by the magnetic field generated by the stationary coil. This simplifies the structure, reduces production difficulty, and effectively improves driving performance. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of the anti-shake mechanism in an embodiment of the present invention;

[0040] Figure 2 This is an exploded view of the image stabilization mechanism in an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of the FPC component in an embodiment of the present invention;

[0042] Figure 4 This is an FPC circuit diagram in an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the upper and lower jaws in an embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram of an integrated OIS substrate and a separate OIS substrate in an embodiment of the present invention;

[0045] Figure 7 This is an exploded view of a lens driving device with image stabilization and focusing functions in an embodiment of the present invention;

[0046] Figure 8 This is a schematic diagram of the overall structure of the lens driving device with image stabilization and focusing functions and the image stabilization mechanism after assembly in an embodiment of the present invention.

[0047] Figure 9 This is an exploded view of the assembly of the lens driving device and the image stabilization mechanism with image stabilization and focusing functions in an embodiment of the present invention.

[0048] Figure 10 This is an exploded view of the assembly of the outer casing, AF motor, and anti-shake mechanism in an embodiment of the present invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be further described below.

[0050] This invention proposes a lens driving device with image stabilization and focusing functions, comprising an AF motor and an image stabilization mechanism.

[0051] In this embodiment, the structure of the image stabilization mechanism is described first, such as... Figure 1 and Figure 2 As shown, the image stabilization mechanism includes an SMA cable 1, an OIS spring 2, an upper claw 3, a base 4, and an FPC assembly;

[0052] Among them, such as Figure 3 As shown, the FPC assembly includes an FPC5, an OIS support 6, a lower claw 7, and a connecting block 8. The OIS support 6 is welded to the surface of the FPC5, which can significantly reduce the risk of falling and improve structural stability. The lower claw 7 is fixed to the surface of the FPC5 by the connecting block 8, which is attached to the surface of the FPC5 by welding or SMT. The lower claw 7 is also connected to the FPC5 via the connecting block 8.

[0053] FPC5 is fixed on base 4, OIS spring 2 is supported on OIS support 6, upper claw 3 is fixed on OIS spring 2, and both ends of SMA wire 1 are fixed on upper claw 3 and lower claw 7 respectively. After SMA wire 1 is energized, the change in length of SMA wire 1 drives the horizontal displacement adjustment of OIS spring 2.

[0054] In this embodiment, as Figure 4 As shown, the FPC5 has four input circuits 10 and at least one ground circuit 11;

[0055] Each input circuit 10 has an input pin 12 connected to its input terminal and a lower claw 7 connected to its output terminal.

[0056] The input terminal of the grounding circuit 11 is connected to the OIS spring 2, and the output terminal of the grounding circuit is connected to an output pin 13;

[0057] Four input pins 12 and output pins 13 are arranged in an orderly manner on one side of the FPC5.

[0058] Corresponding to the four input circuits 10 mentioned above, there are four lower jaws 7. The four lower jaws 7 are arranged in pairs, forming two groups. The two groups are located at opposite corners of FPC5, and the two lower jaws 7 in each group are arranged symmetrically from left to right.

[0059] There are two upper claws 3, each upper claw 3 includes two terminals arranged symmetrically on the left and right, and the two upper claws 3 are respectively located at the diagonal of the OIS spring 2;

[0060] like Figure 5 As shown, the upper jaw 3 and the lower jaw 7 can have various locking structures, and the preferred solution is as follows: Figure 5 b. The extensions of the upper jaw 3 and the lower jaw 7 are bent to form a terminal post with a bending angle of 90 degrees. The end of the terminal post is provided with a groove for winding the SMA wire 1. After the SMA wire 1 is wound around the groove, it is fixed to the terminal post by welding. Compared with other jaw structures, this structure is easier to process, greatly improving production efficiency. At the same time, wiring is more convenient and assembly efficiency is improved.

[0061] The diagonal lines of the upper claw 3 and the lower claw 7 are two intersecting diagonal lines. An SMA wire 1 is arranged between adjacent terminals and the lower claw 7, so that the four SMA wires 1 form a square or rectangular structure.

[0062] In this embodiment, each side of the OIS spring 2 is provided with a spring elastic arm 14; at least one spring elastic arm 14 is welded and fixed to the input terminal of the grounding circuit to achieve signal conduction.

[0063] In this embodiment, as Figure 6 As shown, the upper claw 3 and the OIS spring 2 are integrally formed or separately connected;

[0064] like Figure 6 As shown in Figure a, when the upper jaw 3 and the OIS spring 2 are integrally formed, the assembly process can be simplified; when the upper jaw 3 and the OIS spring 2 are separately connected, the upper jaw 3 and the OIS spring 2 are welded and fixed, such as... Figure 6 b. The split structure allows for flexible adjustment of component materials and thicknesses, and the thicknesses of the upper claw 3 and OIS spring 2 can be different.

[0065] The working principle of the image stabilization mechanism of this application will be described below: The OIS spring 2 is connected to the AF motor and performs image stabilization compensation adjustment on the AF motor lens, such as by adjusting the horizontal displacement of the OIS spring 2 in the X and Y axes (the X and Y axes are shown in the attached figure). Figure 1(As indicated by the logo) drives the AF motor back to its original position, thereby achieving the effect of image stabilization and avoiding affecting the image quality of the camera equipment. Specifically, when the sensor detects a shift in the X and Y axes of the lens, it inputs an electrical signal to the input circuit 10 of the FPC5 based on the amount of shift. The input circuit 10 transmits the electrical signal through the lower jaw 7 to the connected SMA wire 1. After the SMA wire 1 becomes conductive, it stretches or shortens its length according to the magnitude of the current, based on the characteristics of thermal expansion and contraction. Since the SMA wire 1 is fixed at one end of the lower jaw 7, the change in the length of the SMA wire 1 will pull the OIS spring 2 to generate a displacement in the X and / or Y axes, thus achieving the effect of driving the lens to return to its original position for image stabilization. In the SMA image stabilization structure of this embodiment, the current loop is as follows: the input circuit 10 inputs current to the corresponding lower jaw 7, the lower jaw 7 inputs current to the corresponding SMA wire 1, the SMA wire 1 transmits current to the corresponding upper jaw 3, the upper jaw 3 transmits current to the grounding circuit 11 through the spring elastic arm 14 of the OIS spring 2, and finally transmits it to the signal output pin 13.

[0066] Based on the image stabilization mechanism, the present invention also proposes a lens driving device with image stabilization and focusing functions. The lens driving device with image stabilization and focusing functions is composed of a shielding cover 15, a lens carrier 16, a driving component and an AF base 17.

[0067] Among them, such as Figure 8 and Figure 9 As shown, the bottom of the AF base 17 is provided with a protrusion 26 that connects to the OIS spring 2 in the image stabilization mechanism. The image stabilization mechanism and the AF motor are connected by the fixed connection between the protrusion 26 and the AF base 17. The middle part of the AF motor and the middle part of the image stabilization mechanism are coaxially provided with a through hole for mounting the lens.

[0068] As described above, the image stabilization mechanism adjusts the horizontal displacement of the OIS spring 2 along the X and Y axes (as shown in the attached figure). Figure 1 (As indicated by the markings) drives the AF motor to return to its original position, thereby achieving the technical effect of lens image stabilization. Furthermore, the lens drive device with image stabilization and focusing functions utilizes a drive circuit to achieve vertical displacement (Z-axis displacement) of the lens carrier 16, thereby adjusting the lens focal length. Thus, the overall drive device possesses lens focusing and image stabilization functions.

[0069] The specific structure of the lens drive device with image stabilization and focusing functions is as follows: Figure 7As shown, the lens carrier 16 is disposed inside the AF base 17. The side wall of the lens carrier 16 and the inner wall of the AF base 17 are provided with mutually cooperating ball grooves 18. Multiple balls 19 are disposed in the ball grooves 18 according to the height direction of the lens carrier 16. Under the drive of the drive assembly, the lens carrier 16 achieves vertical displacement in the height direction relative to the AF base 17. The shielding cover 15 is disposed on the surface of the AF base 17.

[0070] In this embodiment, as Figure 7 As shown, at least two sets of ball bearing grooves 18 are provided, located diagonally opposite each other on the lens carrier 16; alternatively, four or other numbers of ball bearing grooves 18 can be provided at different positions on the inner walls of the lens carrier 16 and the AF base 17. The ball bearing drive design is simple in structure and simplifies the assembly process. It overcomes the problems of existing technologies where the AF motor needs to overcome the elastic force of the upper and lower springs to drive the carrier in the Z-axis motion, as well as the problems of poor carrier optical axis stability and posture discrepancies. This facilitates miniaturization, low power consumption, and improved device durability.

[0071] In this embodiment, the driving components include an AF driving coil 20, a circuit board 21, a position sensor 22, and an AF driving magnet 23;

[0072] Circuit board 21 is located on one side of AF base 17. Circuit board 21 is PCB or FPC. Position sensor 22 and AF drive magnet 23 are both located on circuit board 21. AF drive magnet 23 is located on the side wall of lens carrier 16 and is located on the same side as AF drive coil 20. After AF drive coil 20 is energized, it induces a magnetic field with AF drive magnet 23 to drive lens carrier 16 to achieve vertical displacement (i.e. Z-axis displacement).

[0073] In this embodiment, anti-collision protrusions 24 are provided on the side of the AF base 17 relative to the lens carrier 16 and on the side of the AF base 17 relative to the shield 15; to prevent the magnetic field from being too strong, the vertical displacement of the lens carrier 16 from being too large, and collision damage to the upper and lower components. The anti-collision protrusions 24 can be made of flexible material.

[0074] The shield 15 is fixedly connected to the AF base 17 by a snap-fit ​​connection, which facilitates positioning and improves connection stability. On the one hand, the shield 15 acts as a magnetic material to concentrate the magnetism of the AF drive magnet 23 and reduce magnetic interference to the outside world; on the other hand, it can prevent the ball bearings 19 from moving outward.

[0075] like Figure 10 As shown, the AF motor is also fitted with a housing 25, which serves to house and protect the internal mechanism. The housing 25 has a through hole in the middle that is coaxial with the middle of the AF motor, which facilitates the installation of the lens.

[0076] In this embodiment, the pins of the circuit board 21 and the pins of the FPC5 in the anti-shake mechanism are arranged on the same side, which facilitates circuit conduction and prevents the circuit layout from becoming too cluttered. The base 4 in the anti-shake mechanism has a baffle 9 on its side for supporting and positioning the pins of the circuit board 21, which facilitates the positioning and installation of the AF motor relative to the anti-shake mechanism.

[0077] Specifically, the working principle of the lens drive device with image stabilization and focusing functions is as follows: When the lens needs to be focused, the AF drive coil 20 is energized through the pins of the circuit board 21. After being energized, a magnetic field is generated with the AF drive magnet 23, thereby driving the lens carrier 16 to achieve Z-axis displacement through the AF drive magnet 23, and finally completing the focal length adjustment of the lens. During the shooting process, the image stabilization mechanism drives the AF motor and the lens to synchronously adjust the offset of the X and Y axes to achieve the effects of focusing and image stabilization.

[0078] The above are merely preferred embodiments of the present invention and do not constitute any limitation on the present invention. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and content disclosed in the present invention without departing from the scope of the present invention shall be deemed to have remained within the protection scope of the present invention.

Claims

1. A stabilization mechanism, characterized in that, Includes SMA wire, OIS spring, upper claw, base and FPC assembly; The FPC assembly includes an FPC, an OIS support, a lower jaw, and a connecting block; the OIS support is fixed to the surface of the FPC, the lower jaw is fixed to the surface of the FPC through the connecting block, and the lower jaw is connected to the FPC via the connecting block for signal conduction. The FPC is fixed to the base, the OIS spring is supported on the OIS support, the upper claw is fixed to the OIS spring, and the two ends of the SMA wire are respectively fixed to the upper claw and the lower claw. When the SMA wire is energized, the change in the length of the SMA wire drives the horizontal displacement adjustment of the OIS spring. The FPC is equipped with four input circuits and at least one ground circuit; Each input circuit has an input pin connected to its input terminal and a lower jaw connected to its output terminal. The input terminal of the grounding circuit is connected to the OIS spring, and the output terminal of the grounding circuit is connected to an output pin. The four input pins and the output pins are arranged in an orderly manner on one side of the FPC; The four lower jaws are arranged in pairs, forming two groups. The two groups are located at opposite corners of the FPC, with the two lower jaws in each group arranged symmetrically from left to right. The number of upper claws is two, and each upper claw includes two terminals arranged symmetrically on the left and right sides. The two upper claws are respectively located at the diagonal of the OIS spring. The diagonal lines of the upper claw and the lower claw are two intersecting diagonal lines. An SMA wire is arranged between adjacent terminals and the lower claw, so that the four SMA wires form a square or rectangular structure. The OIS spring has a spring elastic arm on each side; at least one of the spring elastic arms is welded and fixed to the input terminal of the grounding circuit to achieve signal conduction.

2. The image stabilization mechanism according to claim 1, characterized in that, The connecting block is attached to the FPC surface by welding or SMT. The OIS support is welded to the surface of the FPC.

3. The image stabilization mechanism according to claim 1, characterized in that, The upper claw is integrally formed with or separately connected to the OIS spring; When the upper claw and the OIS spring are integrally formed, the extension of the upper claw is bent to form a terminal post with a bending angle of 90 degrees. The end of the terminal post is provided with a groove for winding the SMA thread. When the upper jaw is separately connected to the OIS spring, the upper jaw is welded and fixed to the OIS spring.

4. A lens driving device with image stabilization and focusing functions, characterized in that, The image stabilization mechanism as described in any one of claims 1-3 includes a shield, a lens carrier, a drive assembly, an AF base, and the image stabilization mechanism; The lens carrier is disposed inside the AF base. The side wall of the lens carrier and the inner wall of the AF base are provided with mutually cooperating ball grooves. Multiple balls are disposed in the ball grooves according to the height direction of the lens carrier. Under the drive of the drive assembly, the lens carrier achieves vertical displacement in the height direction relative to the AF base. The shielding cover is disposed on the surface of the AF base. The bottom of the AF base is provided with a protrusion that connects to the OIS spring in the anti-shake mechanism. The anti-shake mechanism and the AF motor are connected by the fixed connection between the protrusion and the AF base. The AF motor and the image stabilization mechanism are coaxially provided with through holes for mounting the lens.

5. The lens driving device with image stabilization and focusing functions according to claim 4, characterized in that, The driving assembly includes an AF driving coil, a circuit board, a position sensor, and an AF driving magnet; The circuit board is located on one side of the AF base. The position sensor and the AF drive magnet are both located on the circuit board. The AF drive magnet is located on the side wall of the lens carrier and is located on the same side as the AF drive coil. When the AF drive coil is energized, it forms a magnetic field with the AF drive magnet, thereby driving the lens carrier to achieve vertical displacement.

6. The lens driving device with image stabilization and focusing functions according to claim 4, characterized in that, The ball bearing groove is provided in at least two sets, which are located at opposite corners of the lens carrier; The AF base has anti-collision protrusions on the side opposite to the lens carrier and on the side opposite to the shielding cover. The shielding cover is fixedly connected to the AF base by a snap-fit ​​connection. The AF motor is also fitted with a housing, and the housing has a through hole in the middle that is coaxial with the middle of the AF motor, which facilitates the installation of the lens.

7. The lens driving device with image stabilization and focusing functions according to claim 5, characterized in that, The pins of the circuit board and the pins of the FPC in the anti-shake mechanism are arranged on the same side, which facilitates circuit conduction. The anti-shake mechanism has a baffle on the side of the base for supporting and positioning the circuit board pins; The circuit board is either a PCB or an FPC.

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